Electric-arc lamp.



PATENTED DEC. 1, 1903;

H. EMONDS.

ELECTRIC ARC LAMP.

APPLICATION FILED MAY 14, 1903.

N0 MODEL.

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iri'o, 745,427. Patented December 1, 1903.

UNITED STATES PATENT OFFICE.

HUBERT EMONDS, OF AIX-LA-CI-IAPELLE, GERMANY, ASSIGNOR TO BRUSSEL-AACIIENER GLAS-MANUFAOTUR LEYMANNS & KEIM, OF AIX-LA-OIIA- PELLE,GERMANY.

ELECTRIC-ARC LAM Pu SPECIFICATION forming part of Letters Patent No.745,427, dated December 1, 1903.

Application filed May 14, 1903. SerialNo. 157,062. (No model) To aZZ1071,0717, it mwy ooncern: glass casing surrounding the carbons. To

Be it known that I, I-IUBERT EMONDS, elecavoid all these drawbacks, thefollowing contrician, asubject of the King of Prussia, Emstruction ismade use of. peror of Germany, residing at 48 Lothringer- Anelectromagnetic coil a is connected with 5 strasse, Aix-la-Chapelle, inthe Kingdom of the tube Z), carrying on its lower end a disk 0, Prussia,Empire of Germany, have invented by whose annular double flange (1 isheld the certain new and useful Improvements in Arcopen end of the glasscasing 6, thus forming an Lamps with Oxygen-Pumps; and I do herebyhermetically-closed chamber around the cardeclare the following to be afull, clear, and bons f and g,of which the lowerone, f,is placed I0exact description of the invention, such as upon the base 71 arrangedwithin the glass will enable others skilled in the art to which itcasing e, whereas the upper carbon 9 is surappertains to make and usethe same. rounded and held by a tube i, carrying the My presentinvention relates to arc-lamps, soft-iron core 75 and suspended from thescrewand particularly to that class of arc-lamps plug Z of anyinsulating material by means of 15 especially designed for very lengthyburning a helical spring m, whose other function will periods. a be morefully explained later on. Upon the One of the objects of my invention isto disk 0 is mounted a pump-cylinder n, and in provide means wherewithto effectually rethe latter a plunger-piston 0 is arranged and move thesuperfluous oxygen usually accumovably connected at p to the heavy rod qof 2o mulating in the glass casing surrounding the very soft ironentering the electromagnetic carbons during a time of disuse, whoseprescoil a, placed in alinement above the cylinder ence retards theformation of the are of light 71 and connected, on the onehand, by thewire and causes the flickering of the latter when 8 to the coil a, and,on the other hand, by the formed. wire 25 to the tube 7). Directlybeneath the 75 25 Another object of the invention is toproplunger-piston o the disk 0 is provided with vide means to preventthe breaking of said an opening a, which under normal condition glasscasing in case an explosion of the accuis closed by the ball-valve 1).To let the latmulate'd gases should take place when sendter under allconditions find its seat, that part ing the electric current through thelamp. of the surface of the disk 0 inclosed by the 30 The accompanyingdrawing shows a verticylinder at is sloping downwardly to the opencalsectional view of the diagrammaticallying a. In a similar manner the topof the represented new arc-lamp. plunger-piston 0 is provided with anopening In arclamps especially designed for very w, capable of beingclosed by the ball-valve lengthy burning periods superfluous oxygen 0;.hen now the electric current is admit- 3 5 will accumulate in the glasscasing surroundted to the electromagnetic coil a, it will flow ing theircarbons on account of the imperfecthrough the latter, from thence by wayof wire tions in the construction of their fittings, s to the coil 0',and reach the tube 1) bymeans which, being manufactured in largequantiof the wire 25. The tube Z) will lead the curties, are not aseffectually excluding the air rent to the wire y, connecting the tube 1)with t 40 as desirable. "When under these conditions the helical springon, attached to the upper the arc-lamp is connected with a circuit, theend of the tube 1', whose lower end is provided are of light will soonbe interrupted on acwith a hinged catch ,2, surrounding and holdcount ofthe expansion of the heated oscillating the upper carbon 9 by means ofits oneing air in said glass casing, thus causing the sided attachmentto the tube 1', thereby trans- 45 flickering of the light. Theexplosions spoken mitting the electric current to the carbon g, of aboveare another great drawback to this from whence it is passing to thecarbon f, wire class of lamps as at present constructed and 1, andresistance-coil 2, and from thence back are caused by the ignition ofthe gases which to the circuit-line. usually are accumulating during aprolonged As soon as the electric current is flowing, I00 50 disuse ofsuch lamps and which when taking as indicated above, the core 7; and therod q,

place are with rare exceptions destroying the acting as core to the coil0, will be drawn upward through the influence of the electromagneticcoils a and 0', respectively, whereby the motion of the core causes thecarbon 9 to ascend, thus establishing the arc of light between thepoints of the carbons f and g, whereas the upward motion of the rod qcauses the plunger-piston 0 to ascend, which in turn will draw theball-valve i] upward, and thereby remove the superfluous amount ofoxygen which may have accumulated in the glass casing during the time ofdisuse of the arc-lamp. The ball-valve 50 remains, of course, seatedduring the upward motion of the plunger-piston 0, so that the volume ofoxygen removed from the interior of the glass casing 0 will beheldbetween the disk 0 and the hollow plunger-piston 0 as the ball-valve 'Uis closing the opening a the instant the carbon g has been sufficientlyraised to establish the are of light. As'soon as the superfluous oxygenhas been effectually removed in the way described above normalconditions between oxygen and nitrogen are established within the glasscasing and an extremely steady light secured. Upon cutting off theelectric current the carbon 9 will drop down and contact with the lowercarbon f, whereby the catch may loosen and regain its hold upon thecarbon fin any suitable manner in order to be ready to raise the latterwhen the current is again admitted to the coil a. Simultaneously withthe dropping of the core 7.: the rod q of the plunger-piston 0 is givenfree by the electromagnetic coil 4', causing the plunger-piston 0 todrop to the bottom of the cylinder 12, whereby the ball-valve x will beopened to let the oxygen filling the space between both ball-valvesescape into the atmosphere.

Besides establishing the arc of light far quicker than hitherto andsecuring a very steadily burning light by removing the superfluousoxygen from the interior of the glass casing c, the burning period ofthe arc-lamp is considerably prolonged.

If for certain sizes of arc-lamps one pump should prove to beinsuflicient, two or more of them may be provided. In case the gasescollecting within the glass casing during the disuse of the arc-lampshould be present in such proportions that upon the formation of the areof light an explosion is taking place the two ball-valves, acting forthe time being as simple relieve-valves, will be opened through thepressure created by the explosion and let the products of explosionescape into the at mosphere without endangering the glass casing in thevery least, which hitherto under similar conditions was destroyed withvery rare exceptions.

I do not desire to limit myself to the precise constructions andarrangements shown, as it is obvious that various modifications may .bemade therein without departing from the essential features of myinvention.

I claim 1. In an arc-lamp of the class described,

the combination with the closed chamber surrounding the lamp-carbons ofan electromagnetically-operated oxygen-pump comprising a pump-cylinder;a valve to establish communication between the interior of said closedchamber and said pumpcylindcr, a plungcrpiston within saidpump-cyliinler; a valve in the top of said plunger-piston to establishcommunication between the interior of said plunger-piston and theatmosphere; an electromagnetic coil in electric connection with themeans causing the vertical motion of the upper carbon and with the meansconducting the electric current from said electromagnetic coil to saidupper carbon; and a plungerpiston rod operated by said electromagneticcoil.

2. In an arc-lamp of the class described, the combination with anelectromagnetic coil of a conducting-tube partly surrounded by saidcoil; a screw-plug hermetically closing the upper end of said tube; alamp-carbon arranged in said tube and operated by said electromagneticcoil; a double-flanged disk on the lower end of said tube; a glass casinheld by the double flange of said disk; a second lamp-carbon arrangedwithin said glass casing; a pum ji-cylinder mounted upon said disk; avalve for establishing communication between the interior of the glasscasing and said pinup-cylinder; a plunger-piston in said pump-cylinder;a valve in said plunger-piston for establishing communication betweenthe inside of the plunger-piston and the atmosphere; a secondelectromagnetic coil electrically connected with the firstmentionedelectromagnetic coil and with the tube partly surrounded by the latter;and a rod movably secured to said plunger-piston and operated by saidsmaller electromagnetic coil.

In an arc-lamp of the class described, the combination with anelectromagnetic coil causing the motion of the upper lamp-carbon of atube partly surrounded by said coil; an insulating screw-plughermetically closing the upper end of said tube; a smaller tube withinthe first-named tube; a hollow core forming part of the smaller tube andcapable of being influenced by said electromagnetic coil when the latteris energized; a hinged catch at the lower end of said smaller tube, acarbon within the latter held by said catch; an elastic connectionbetween the upper end of said smaller tube and said screwplug; anelectric conductor between said larger tube and said elastic connection;a flanged disk on the lower end of the larger tube; a glass casingheldby said flanged disk; a base placed within said glass casin g; a car bonsupported by said base; an electric con ductor passing through saidglass casing and connected with said base; an oxygen-pump placed uponsaid flanged disk and communieating with the interior of said glasscasing, and a second electromagnetic coil operating said oxygen-pump andelectrically connected closed chamber suspended from the lower end ofsaid tube, a second lamp-carbon arranged within and supported by saidclosed chamber; an oxygen-pump mounted upon the top of said closedchamber and communicating with the interior thereof; a secondelectromagnetic coil for operating said pump and electrically connectedwith the means operating the upper lamp-carbon and with the tubesurrounding the latter.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

HUBERT EMONDS.

\Vitnesses:

HENRY QUADFLIEG, D. J. REUTER.

